big n daft has already pointed out that higher rights may exist. The rights of way legislation was meant to create a register of proven rights, not to create a means by which access could be restricted. Sadly, too many landowners think that the rights recorded on the definitive map are the most access they have to give, when it should be treated as the minimum.
Anyway, one legally proven way of establishing higher rights is to ride a path, openly, without permission or objection from the landowner, for 20 years. This is called presumed dedication of a right of way. If that isn’t legal sanction for riding footpaths, I don’t know what is.